package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现自动填充
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect
{
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut()
    {


    }

    /**
     * 前置通知
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint)
    {
        log.info("开始进行自动填充");

        //获取拦截到的方法的操作方式
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0)
        {
            return;
        }

        Object arg = args[0];

        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        if (operationType == OperationType.INSERT)
        {
            try
            {
                Method setCreateTime = arg.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setCreateUser = arg.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateTime = arg.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setCreateTime.invoke(arg, now);
                setCreateUser.invoke(arg, currentId);
                setUpdateTime.invoke(arg, now);
                setUpdateUser.invoke(arg, currentId);
            }
            catch (Exception e)
            {
                throw new RuntimeException(e);
            }
        }
        else if (operationType == OperationType.UPDATE)
        {
            try
            {
                Method setUpdateTime = arg.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = arg.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setUpdateTime.invoke(arg, now);
                setUpdateUser.invoke(arg, currentId);
            }
            catch (Exception e)
            {
                throw new RuntimeException(e);
            }
        }
    }
}
